"Am I Evil?" is a song by British heavy metal band Diamond Head released on their 1980 debut album Lightning to the Nations. The song was written by vocalist Sean Harris and guitarist Brian Tatler and released on Happy Face Records, the band's own label. The song was immediately popular among the metal circles in the United Kingdom around the time of its release, but only rose to international prominence after Metallica covered as a B-side on their "Creeping Death" single in 1984; the cover was re-released on their 1998 covers album Garage Inc. The song was influenced by the Black Sabbath song "Symptom of the Universe."

The song was originally released on Diamond Head's 1980 debut, Lightning to the Nations, but then also re-recorded for their second album Borrowed Time. It remains a live favourite and is still included in the band's setlist to this day. However, Sean Harris has gotten fed up with continually playing "Am I Evil?", one of the reasons he took the stage dressed as the Grim Reaper during their performance at the National Bowl.

The song has roots with Gustav Holst's "Mars, the Bringer of War" (from The Planets Suite) and used a riff, that was used earlier on "Ring of Fire" by The Eric Burdon Band in 1974.

The song was made most famous by Metallica's cover of the song, found on the 1988 re-release and the Japanese version of its debut album Kill 'Em All (the original version of the album lacks the inclusion of the cover), though the cover was originally released as a b-side to the "Creeping Death" single in 1984, and was later released on Garage Inc. in 1998. The song has also been featured in Metallica's live set throughout its career, often in a faster and heavier version. Hetfield also changed the final chorus from "Am I evil? Yes, I am" to "Am I evil? Yes, I fucking am!" Diamond Head has stated that the band's members are flattered by the cover, and that the royalties from it have enabled the band to continue.Faith No More has also covered the song.

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